What is the resistance on the brake coil? The coil driver circuit for the brake is found on the Tractor Manager card not the Carriage Control Card. You said that you changed the brake(deadman) switches, but is the signal getting to the Tractor manager card? The system has to have inputs from both to release the brake. Let us know what you find.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.